The Alenza Sport A/S RFT from Bridgestone is a premium all-season tire that's used as original equipment on select BMW vehicles. The Alenza Sport A/S RFT features circumferential and lateral grooves to evacuate water and resist hydroplaning, a long-wearing tread formulation, low-profile sidewall, and a tread pitch that's computer tuned to resist hydroplaning. What's more, the Alenza Sport A/S RFT's run-flat design lets a driver keep going up to another 50 miles even in the event of total loss of inflation pressure.